I think I have seen this on some other drivers (maybe yaesu or baofeng?). I thought the ugly, but acceptably working solution, was to just chew the extra ack if encountered. This is assuming that you read, or flush, the entire receive buffer from radio, rather than just one byte, after sending a "frame" and checking the first byte received is ack.

From: Jim Unroe via chirp_devel chirp_devel@intrepid.danplanet.com To: chirp-devel chirp_devel@intrepid.danplanet.com Sent: Thursday, June 16, 2016 9:08 PM Subject: [chirp_devel] Random double ACK during upload

I am working with a radio that I am having a problem with the upload procedure. Normally, after a "frame" is sent, the radio replies with an ACK and the programming software sends the next "frame", another ACK is received and so on.

The problem is that randomly the radio with reply with 2 ACKs instead of 1. Currently my upload progresses fine until the double ACK is encountered.

My upload code is below. Does anyone have any suggestions for how I can bypass these occasional extra ACKs?

Thanks in advance, Jim

def _upload(radio):     """Upload procedure"""

MEM_SIZE = 0x7000

# put radio in program mode and identify it     _do_ident(radio)

# UI progress     status = chirp_common.Status()     status.cur = 0     status.max = MEM_SIZE / BLOCK_SIZE     status.msg = "Cloning to radio..."     radio.status_fn(status)

# the fun start here     for addr in range(0, MEM_SIZE, BLOCK_SIZE):         # sending the data         data = radio.get_mmap()[addr:addr + BLOCK_SIZE]

frame = _make_frame("W", addr, BLOCK_SIZE, data)

_send(radio, frame)

# receiving the response         ack = _rawrecv(radio, 1)         if ack != "\x06":             msg = "Bad ack writing block 0x%04x" % addr             raise errors.RadioError(msg)

# UI Update         status.cur = addr / BLOCK_SIZE         status.msg = "Cloning to radio..."         radio.status_fn(status)

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